Porter Cable PCCK640LB 20 V MAX 1/4" Cordless Impact Driver Kit, 20.0 V, 1450"-lb. Max. Torque

These cordless impact drivers are made by Porter Cable and powered by a compatible 20V Porter Cable battery. They use an impact force to increase torque when making holes and driving fasteners. Tool batteries can often be used with tools of the same brand, battery series, and voltage. Voltage describes the level of power the battery provides. Amp-hours (Ah) describes the amount of power the battery holds (its capacity), which determines how long a fully charged battery can perform before needing a recharge. The higher the Ah rating of the battery, the greater its storage capacity. As voltage and Ah ratings increase so do the weight and bulk of the battery and the tool it powers.